CN102840982B - Service life verification tester for ceramic bearing - Google Patents
Service life verification tester for ceramic bearing Download PDFInfo
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- CN102840982B CN102840982B CN201210228869.2A CN201210228869A CN102840982B CN 102840982 B CN102840982 B CN 102840982B CN 201210228869 A CN201210228869 A CN 201210228869A CN 102840982 B CN102840982 B CN 102840982B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 26
- 238000012795 verification Methods 0.000 title claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 201
- 239000001307 helium Substances 0.000 claims abstract description 56
- 229910052734 helium Inorganic materials 0.000 claims abstract description 56
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000004088 simulation Methods 0.000 claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000007613 environmental effect Effects 0.000 claims abstract description 15
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 15
- 239000010439 graphite Substances 0.000 claims abstract description 15
- 239000000428 dust Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000000429 assembly Methods 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract 2
- 238000005461 lubrication Methods 0.000 abstract 2
- 239000008187 granular material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention provides a service life verification tester for a ceramic bearing. The service life verification tester is characterized by comprising a transmission system, a loading system, an environment simulation system and a measuring system, wherein the transmission system is used for transmitting dynamic force and driving a test spindle (19) equipped with a test bearing (14) to rotate so as to calculate the service life of the test bearing (14); the loading system is used for loading the test bearing (14) according to actual loading conditions; the environment simulation system is used for simulating high temperature, no lubrication, helium gas and graphite dust in an actual operating environment; and the measuring system is used for measuring environmental parameters and status parameters of the test bearing (14) during a test process. The service life verification tester for the ceramic bearing has the advantages of being capable of verifying the service life of the ceramic bearing in the atmosphere with high temperature, no lubrication and helium gas, being good in reusability, being capable of performing verification tests on the service lives of ceramic bearings in various specifications, and saving cost.
Description
Technical field
The present invention relates to ceramic bearing technical field, particularly ceramic bearing service life verification tester under a kind of high temperature, unlubricated, helium atmosphere.
Background technology
The high-temperature reactor that high temperature gas cooled reactor is take graphite as moderator, helium is cooling medium is that a kind of inherent safety is good, generating efficiency is high, purposes advanced nuclear reactor very widely.Include sports equipment in Helium fan in HTGR Nuclear Power Plant primary Ioops, control rod drive mechanisms (CRD), KLAK system and fuel handling system four systems, need to select bearing to support, the reliability of bearing is extremely important.But the split bearing of this four systems will work under being in high temperature, unlubricated, helium atmosphere, and split bearing operating ambient temperature even reaches 250 DEG C.In view of the working environment that bearing is harsh, ceramic bearing will be preferably select.But the life-span of ceramic bearing product ripe on market is all add up gained under normal temperature, atmospheric environment; For under high temperature, unlubricated, helium atmosphere, whether the life and reliability of ripe ceramic bearing product can change, especially in this application scenario very high to bearing reliability requirement of high temperature gas cooled reactor, whether ceramic bearing is enough reliable, carried out relevant report without any open source literature at present, these problems all do not have answer at present.So, only have and obtain answer by test.For this reason, need the actual working environment designing test battery unit simulation high temperature gas cooled reactor split bearing, thus the life-span of checking ceramic bearing under high temperature, unlubricated, helium atmosphere.
The design of test unit faces following difficult point:
1) high temperature, helium environment is realized.There is a lot of difficulty in the sealing of helium itself, there is the sealing realizing helium when turning axle rotates especially difficult;
2) certain graphite granule concentration is ensured.Because high temperature gas-cooled heap memory is at graphite granule, therefore test unit also should be able to realize the bearing working environment of identical graphite granule concentration;
3) loading of bearing.Simulation actual condition applies axial load and radial load to bearing;
4) compatibility of test unit.Owing to needing the bearing designation of checking more, in order to cost-saving, wish that bearing still to be tested can be verified in test battery device.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is to provide a kind of ceramic bearing service life verification tester, the life-span of checking ceramic bearing under high temperature, unlubricated, helium atmosphere.
(2) technical scheme
In order to solve the problem, the invention provides a kind of ceramic bearing service life verification tester, it is characterized in that, comprising: kinematic train, for transmitting power, drive arrangements has the test main shaft of test bearing to rotate, to calculate the life-span of test bearing; Loading system, for loading test bearing according to real load operating mode; Environmental simulation system, for the high temperature in simulating practical service environment, unlubricated, helium, graphite dust; Measuring system, for measuring the environmental parameter in process of the test and test bearing state parameter.
Preferably, described kinematic train comprises: variable-frequency motor, torque sensor, magnetic driver, spring bearing, test bearing, test main shaft.Wherein, magnetic driver is between variable-frequency motor and test main shaft, and variable-frequency motor is by magnetic driver transmitting torque, and motoring ring test main shaft rotates; Test main shaft is supported by spring bearing, and test main shaft configuration test bearing, test bearing is positioned at hot test casing.
Preferably, spring bearing is ceramic bearing, and spring bearing internal diameter is less than test bearing bore diameter.
Preferably, described spring bearing configuration spring bearing support set, spring bearing support set configuration spring bearing support set base, spring bearing support set base is connected with the fixing lug boss in hot test casing by bolt, indirectly supports test main shaft.
Preferably, described loading system comprises radial loaded system and axial loading system, and radial loaded system comprises hydraulic radial cylinder, radial force loads connecting rod, and hydraulic radial cylinder loads connecting rod by radial force and applies radial load to test bearing; Axial loading system comprises axial liquid cylinder pressure, axial force loads connecting rod, and axial liquid cylinder pressure loads connecting rod by axial force and applies axial load to test bearing.
Preferably, described test bearing configuration test bearing pressure-bearing cover, the face that test bearing pressure-bearing overlaps relative radial force loading connecting rod is a plane, opens pressure-bearing cover thrust hole on this plane; Described test bearing pressure-bearing cover is static element, and itself and test bearing are unsettled, without any support; One end that described radial force loading connecting rod is not connected with hydraulic radial cylinder embeds test bearing pressure-bearing and overlaps in thrust hole.
Preferably, described axial force loads connecting rod and contacts with test bearing pressure-bearing cover, and the contact end face that axial force loads connecting rod is toroidal.
Preferably, described environmental simulation system comprises: hot test casing, for realizing the effect being incubated and sealing helium; Described hot test box body wall face is divided into 3 layers: inside and outside layer adopts stainless steel, and intermediate course adopts alumina silicate; Described hot test casing offers the hole passed for radial force loading connecting rod and axial force loading connecting rod, and sealed by packing assemblies.
Preferably, described environmental simulation system also comprises: thermal resistance well heater, is placed in hot test casing, for heating the helium in hot test casing; Helium input hole, for being filled with the helium of required purity in hot test casing; Vacuum pump aspirating hole, for vacuumizing before fill helium in hot test casing; Be configured in the fan on test main-axis end, rotate with test main shaft, to stir the graphite dust in hot test casing, the concentration of graphite dust under simulation actual condition; Wherein, the hole that the helium input hole on described hot test casing, thermal resistance well heater are opened, seals hole seam by welding.
Preferably, described measuring system comprises: torque sensor, for measuring moment of torsion and the rotating speed of test main shaft; Rain glass, for measuring the helium pressure in hot test casing; Thermocouple sensor, for measuring the helium temperature in hot test casing; Test bearing temperature sensor, for measuring the temperature of test bearing in process of the test.
(3) beneficial effect
Ceramic bearing service life verification tester under high temperature provided by the invention, unlubricated, helium atmosphere, has the following advantages:
(1) serviceable life of ceramic bearing under high temperature, unlubricated, helium atmosphere can be verified;
(2) test unit reusing is good, can carry out life-span demonstration test to the ceramic bearing of plurality of specifications, cost-saving.
Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Accompanying drawing explanation
With reference to the accompanying drawings and further describe the present invention in conjunction with example.Wherein:
Fig. 1 is according to ceramic bearing service life verification tester schematic diagram under high temperature of the present invention, unlubricated, helium atmosphere.
Fig. 2 is according to test bearing pressure-bearing cover schematic shapes in service life verification tester of the present invention.
Fig. 3 is according to spring bearing support set schematic shapes in service life verification tester of the present invention.
Wherein: 1, variable-frequency motor; 2, torque sensor; 3, magnetic driver; 4, hot test casing; 5, rain glass; 6, hydraulic radial cylinder; 7, axial liquid cylinder pressure; 8, packing assemblies; 9, helium input hole; 10, thermal resistance well heater; 11, testing table support; 12, thermocouple sensor; 13, spring bearing; 14, test bearing; 15, vacuum pump aspirating hole; 16, fan; 17, axial force loads connecting rod; 18, radial force loads connecting rod; 19, main shaft is tested; 20, spring bearing support set; 21, test bearing pressure-bearing cover; 22, test bearing temperature sensor; 23, pressure-bearing cover thrust hole; 24, fixing lug boss; 25, spring bearing support set base.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 1, ceramic bearing service life verification tester under the high temperature that the embodiment of the present invention provides, unlubricated, helium atmosphere, comprising: kinematic train, loading system, environmental simulation system, measuring system four major part.Power is transmitted in the effect of kinematic train, and the test main shaft of drive arrangements test bearing rotates, and calculates the life-span of test bearing.The effect of loading system loads test bearing according to real load operating mode.Environmental simulation system is the high temperature in simulating practical service environment, unlubricated, helium, graphite dust.Measuring system measures the environmental parameter in process of the test and test bearing state parameter.
In embodiments of the present invention, kinematic train forms primarily of following equipment: variable-frequency motor 1, torque sensor 2, magnetic driver 3, spring bearing 13, test bearing 14, test main shaft 19.Its action principle is: test main shaft 19 configures test bearing 14, and test main shaft 19 is supported by spring bearing 13, and by variable-frequency motor 1 by magnetic driver 3 transmitting torque, motoring ring test main shaft 19 rotates.Magnetic driver 3 is between variable-frequency motor 1 and test main shaft 19.In order to the confidence level of warranty test result, spring bearing 13 Ceramics bearing.Wherein, spring bearing 13 internal diameter is less than test bearing 14 internal diameter.
In embodiments of the present invention, loading system comprises radial loaded system and axial loading system.Radial loaded system comprises hydraulic radial cylinder 6, radial force loads connecting rod 18; Axial loading system comprises axial liquid cylinder pressure 7, axial force loads connecting rod 17.The principle of work of radial loaded system is as follows: hydraulic radial cylinder 6 loads connecting rod 18 by radial force and applies radial load to test bearing 14.The principle of axial loading system is identical therewith.Only born by test bearing 14 to realize applied load, and in order to warranty test bearing 14 uniform force, take following measure:
1) increase test bearing pressure-bearing cover 21, its structural representation as shown in Figure 2.The face that the relative radial force of test bearing pressure-bearing cover 21 loads connecting rod 18 is a plane.First, if do not take any measure when applying radial load, the stress surface of load will not stop the face of cylinder that rotates, to make the applying of radial load more difficult for one.After increasing test bearing pressure-bearing cover 21, test bearing pressure-bearing cover 21 is static element, the plane that relatively radial force loads connecting rod 18 on test bearing pressure-bearing cover 21 opens pressure-bearing cover thrust hole 23, one end that radial force loading connecting rod 18 is not connected with hydraulic radial cylinder 6 embeds pressure-bearing and overlaps in thrust hole 23, fixed radial load application point.Along with the rotation of test bearing 14, radial load is radially applied to test bearing 14 equably.Secondly, test bearing pressure-bearing cover 21 makes test bearing 14 static area radially increase, so when applying axial load, axial force can be loaded connecting rod 17 and make toroidal with the contact end face that test bearing pressure-bearing overlaps 21, thus evenly apply axial force to test bearing 14 by axial liquid cylinder pressure 7.
2) test bearing pressure-bearing cover 21 and test bearing 14 unsettled, without any support.The object done like this is to ensure that applied load is only born by test bearing 14, conforming to real load operating mode, thus the confidence level of warranty test result.
3) spring bearing 13 increases spring bearing support set 20.For spring bearing 13 increases spring bearing support set 20, as shown in Figure 3, spring bearing support set 20 configures spring bearing support set base 25 to its structure.By bolt, spring bearing support set base 25 is connected with the fixing lug boss 24 in hot test casing 4, indirectly supports test main shaft 19, also do not share the load applied to test bearing 14 simultaneously.
In embodiments of the present invention, environmental simulation system mainly comprises following equipment and parts: hot test casing 4, packing assemblies 8, helium input hole 9, thermal resistance well heater 10, vacuum pump aspirating hole 15, fan 16, magnetic driver 3.
Hot test casing 4 is a seal case, and test bearing 14 is in hot test casing 4.The effect of hot test casing 4 is as follows: one is realize insulation effect, makes the helium temperature in hot test casing 4 maintain about 250 DEG C; Two is the effects realizing sealing helium, and helium is not leaked, and also ensures the purity of helium simultaneously.In order to realize insulation effect, the wall of hot test casing 4 is divided into 3 layers, and inside and outside layer adopts stainless steel, and intermediate course adopts alumina silicate.In order to realize the effect sealing helium, need tappings all on hot test casing 4 to seal.Wherein, test main shaft 19 is bored a hole and is passed through on hot test casing 4, and is revolving part owing to testing main shaft 19, so adopt magnetic driver 3 transmitting torque, motive seal is converted to static seal, realizes the sealing of helium; Radial force loading connecting rod 18 and axial force loading connecting rod 17 are bored a hole and are passed through on hot test casing 4, adopt packing assemblies 8 to seal in perforation place; Other tapping on hot test casing 4, the such as place such as helium input hole 9, thermal resistance well heater 10, seal hole seam by welding, prevent helium leakage.Helium pressure in the casing of maintenance hot test simultaneously 4, a little more than environmental pressure, prevents ambient atmos from entering in hot test casing 4, keeps the purity of helium in hot test casing 4.
The effect of thermal resistance well heater 10 is to helium heating in hot test casing 4, makes the helium temperature in hot test casing 4 reach 250 DEG C.Thermal resistance well heater 10 is placed in hot test casing 4.
The effect of helium input hole 9 is the helium being filled with required purity in hot test casing 4.
The effect of vacuum pump aspirating hole 15 is to vacuumize use before fill helium in hot test casing 4.
Fan 16 is positioned at the axle head of test main shaft 19, will rotate, thus stir the graphite dust in hot test casing 4, the concentration of graphite dust under simulation actual condition along with test main shaft 19.
In embodiments of the present invention, measuring system is measured to the state parameter of experimental enviroment parameter and test bearing 14, mainly comprises following measurement instrument: torque sensor 2, rain glass 5, thermocouple sensor 12, test bearing temperature sensor 22.Torque sensor 2 is used for measuring the test moment of torsion of main shaft 19 and rotating speed; The helium pressure in hot test casing 4 is measured in the effect of rain glass 5; The helium temperature in hot test casing 4 is measured in the effect of thermocouple sensor 12; The effect of test bearing temperature sensor 22 is the temperature measuring test bearing 14 in process of the test.The point layout of test bearing temperature sensor 22 is at pressure-bearing cover thrust hole 23 place.
The ceramic bearing service life verification tester working method of the embodiment of the present invention is as follows:
First, make helium in hot test casing 4 reach required temperature and purity by environmental simulation system, and there is the graphite dust of required concentration.
Secondly, apply required axial load and radial load by loading system to test bearing 14 and remain unchanged.
Then, adjust to required rotating speed by variable-frequency motor, rotated by kinematic train motoring ring test main shaft 19.In rotary course, monitored by the correlation parameter of measuring system to the helium parameter in hot test casing 4 and test bearing 14.
Finally, when the temperature value measured by test bearing temperature sensor 22 occurs abnormal, or total revolution of rotating under required operating mode of test main shaft 19 reach setting upper in limited time, then can stop test, judge whether the life-span of test bearing 14 meets the demands.
For the test bearing 14 of different model, only need processing experiment main shaft 19 again, test main shaft 19 and test bearing 14 are matched.Fresh processed test main shaft 19 is installed on above-mentioned test unit, then can re-starts test to the test bearing 14 of corresponding model according to above-mentioned embodiment, and need not again manufacture test unit for the test bearing 14 of often kind of model, cost-saving.
Claims (6)
1. a ceramic bearing service life verification tester, is characterized in that, comprising:
Kinematic train, for transmitting power, drive arrangements has the test main shaft (19) of test bearing (14) to rotate, to calculate the life-span of test bearing (14);
Loading system, for loading test bearing (14) according to real load operating mode;
Environmental simulation system, for the high temperature in simulating practical service environment, unlubricated, helium, graphite dust;
Measuring system, for measuring the environmental parameter in process of the test and test bearing (14) state parameter;
Wherein, described kinematic train comprises: variable-frequency motor (1), torque sensor (2), magnetic driver (3), spring bearing (13), test bearing (14), test main shaft (19), wherein, magnetic driver (3) is positioned between variable-frequency motor (1) and test main shaft (19), by variable-frequency motor (1) by magnetic driver (3) transmitting torque, motoring ring test main shaft (19) rotates, test main shaft (19) is supported by spring bearing (13), test main shaft (19) configuration test bearing (14), test bearing (14) is positioned at hot test casing (4),
Wherein, described spring bearing (13) configuration spring bearing support set (20), spring bearing support set (20) configuration spring bearing support set base (25), spring bearing support set base (25) is connected with the fixing lug boss (24) in hot test casing (4) by bolt, indirectly supports test main shaft (19);
Wherein, described loading system comprises radial loaded system and axial loading system, radial loaded system comprises hydraulic radial cylinder (6), radial force loads connecting rod (18), and hydraulic radial cylinder (6) loads connecting rod (18) by radial force and applies radial load to test bearing (14); Axial loading system comprises axial liquid cylinder pressure (7), axial force loads connecting rod (17), and axial liquid cylinder pressure (7) loads connecting rod (17) by axial force and applies axial load to test bearing (14);
Wherein, described test bearing (14) configuration test bearing pressure-bearing cover (21), the face that the relative radial force of test bearing pressure-bearing cover (21) loads connecting rod (18) is a plane, opens pressure-bearing cover thrust hole (23) on this plane; Described test bearing pressure-bearing cover (21) is static element, and itself and test bearing (14) are unsettled, without any support; One end that described radial force loading connecting rod (18) is not connected with hydraulic radial cylinder (6) embeds test bearing pressure-bearing and overlaps in thrust hole (23).
2. test unit as claimed in claim 1, it is characterized in that, spring bearing (13) is ceramic bearing, and spring bearing (13) internal diameter is less than test bearing (14) internal diameter.
3. test unit as claimed in claim 1, is characterized in that, described axial force loads connecting rod (17) and contacts with test bearing pressure-bearing cover (21), and the contact end face that axial force loads connecting rod (17) is toroidal.
4. test unit as claimed in claim 1, it is characterized in that, described environmental simulation system comprises: hot test casing (4), for realizing the effect being incubated and sealing helium; Described hot test casing (4) wall is divided into 3 layers: inside and outside layer adopts stainless steel, and intermediate course adopts alumina silicate; Described hot test casing (4) offers the hole passed for radial force loading connecting rod (18) and axial force loading connecting rod (17), and sealed by packing assemblies.
5. test unit as claimed in claim 4, it is characterized in that, described environmental simulation system also comprises: thermal resistance well heater (10), is placed in hot test casing (4), for heating the helium in hot test casing (4); Helium input hole (9), for being filled with the helium of required purity in hot test casing (4); Vacuum pump aspirating hole (15), for vacuumizing before fill helium in hot test casing (4); Be configured in the fan on test main shaft (19) axle head, rotate with test main shaft (19), to stir the graphite dust in hot test casing (4), the concentration of graphite dust under simulation actual condition; Wherein, the hole that the helium input hole (9) on described hot test casing (4), thermal resistance well heater (10) are opened, seals hole seam by welding.
6. test unit as claimed in claim 1, it is characterized in that, described measuring system comprises: torque sensor (2), for measuring rotating speed and the moment of torsion of test main shaft (19); Rain glass (5), for measuring the helium pressure in hot test casing (4); Thermocouple sensor (12), for measuring the helium temperature in hot test casing (4); Test bearing temperature sensor (22), for measuring the temperature of test bearing in process of the test (14).
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| CN201210228869.2A CN102840982B (en) | 2012-07-02 | 2012-07-02 | Service life verification tester for ceramic bearing |
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| CN201210228869.2A CN102840982B (en) | 2012-07-02 | 2012-07-02 | Service life verification tester for ceramic bearing |
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| CN101430245A (en) * | 2008-12-08 | 2009-05-13 | 洛阳轴研科技股份有限公司 | Dynamic simulation test method and testing machine for plastic support bearing used for suspension |
| CN101476934A (en) * | 2008-12-26 | 2009-07-08 | 洛阳轴研科技股份有限公司 | Bearing noise testing method without special requirements to testing environment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109269803A (en) * | 2018-10-10 | 2019-01-25 | 洛阳轴承研究所有限公司 | A kind of bearing test device |
| CN109269803B (en) * | 2018-10-10 | 2021-01-22 | 洛阳轴承研究所有限公司 | Bearing test device |
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